Screw driver handle



Dec. 8, 1936.

M. G. ZONGARO SCREW DRIVER HANDLE Filed Sept. 16, 1935 3 l1 15 0 z 5 T Z \WN 0 11 M w I L 6 U n u Z T 9 r/ 0 a 2 F //\/L/E/\/7'DR MG. ZONGARO av Patented Dec. 8, 1936 UNITED STATES PATENT OFFICE 2 Claims.

This invention relates generally to hand tools, and particularly to a screw driver and handle therefor.

The main object of this invention is the provision of an exceedingly simple and efiicient form of handle for a screw drive bit or similar tool which is easily replaceable for the purpose of making the handle usable on tools of various sizes and shapes but having a common size of shank.

The second object is the provision of a handle of the class described which will form a very secure fastening to the bit itself.

I accomplish these and other objects in the manner set forth in the following specification as illustrated in the accompanying drawing, in which:

Fig. 1' is a side elevation of the screw driver and handle and a portion of the handle broken in longitudinal section.

Fig. 2 is a view similar to Fig. 1 showing the driver and handle in elevation and taken along a plane normal to the plane of Fig. 1.

Fig. 3 is a transverse section taken along the line 3--3 of Fig. 1.

Fig. 4 is a transverse section taken along the the line 4-4 in Fig. 2, showing the bit released.

Fig. 5 is a view similar to Fig. 4 but showing the bit in a clamped position.

Fig. 6 is an elevation of a bit whose shank is adapted to fit my improved handle, but whose driving end is of a reduced dimension.

Similar numbers of reference refer to similar parts throughout the several views.

Referring in detail to the drawing, there is shown a bit I0 whose shank I I is preferably hexagonal in cross section. The handle I2 is provided with a ferrule I3 and has formed therein a hexagonal opening I4 to receive the hexagonal tube I5 which is provided with a slot I6. The tube I5 is secured to the handle I2 and the ferrule I3 by means of a rivet IT. The portion I8 of the tube I5 which extends from the ferrule I3 is provided with the wings I9 which are normally in parallelism and spaced from each other and are provided with the upturned hooks 20, which serve to retain the pivot bar 2I of a key 22.

The key 22 is provided with a narrow central slot 23 which gradually widens into the end 24 nearest the pivot bar 2|. The edges 25 are curved, as illustrated in Fig. 4, and the edges 26 of the wings I9 are also preferably curved, as shown in Fig. 1.

When the key 22 is moved from the position shown in dotted lines in Fig. 1 to the position shown in full lines in this figure, then the wings I9 are moved together, as shown in Fig. 5, clamping the tubular portion I8 upon the shank II.

In Fig. 6 is shown a bit having a large shank 21 and a driving end 28 merely to illustrate how bits of various sizes can be used with my improved handle.

Obviously, the shank II may have attached thereto a socket wrench or other tool, not shown, without departing from the spirit of this invention.

It is essential that the tube l5 be provided with a transverse slot 30 as shown in Fig. 1 in order that the wings 26 may be drawn together without bending the tube I5.

I claim:

1. In a device of the class described a handle having a split tubular insert capable of being contracted, a key having a tapering slot therein, said key being pivotally mounted on said tubular member with the widest end thereof adjacent to the shaft, said tubular member having projecting wings thereon on opposite sides of its split portion, said tubular member having a transverse slot formed across same adjacent to said wings, the outermost edges of said wings being curved and adapted to engage the tapering sides of said key in a manner that said wings will be moved toward each other when said key is moved into parallelism with the axis of the tube.

2. A screw driver having a handle and having a hole in one end thereof and having a split tubular liner extending into said hole and projecting from the end of the handle, a ferrule surrounding the end of the handle through which the tubular liner projects, the projecting end of said tubular liner having a pair of spaced ears formed thereon on opposite sides of the split portion, said ears having hooks formed on the handle side thereof adjacent to said ferrule, means for holding said ferrule and tubular member in close relationship and for securing same to said. handle and. a key having a slot formed therein, one end of which is uniform in width and the opposite end of which widens toward the end which consists of a narrow cross bar adapted to journal in the space between said hooks and said ferrule, said ears having their outermost edges inclined with relation to the axis of the tubular member, the parallel portion of said key being adapted to engage said ears along the length thereof when said key is moved into parallelism with the axis of said tubular member.

MARCO G. ZONGARO. 

